Method of uniting fabric sections



JR. I METHOD OF UNITING FABRIC SECTIONS.

J. BERGER APPLICATION FILED DEC. 30, 1916.

0 9| 1T 7H 4 ma UH A w M2 m .mw a D1 auuemtoz J. BERGERfJR. METHOD OFUNITING FABRIC SECTIONS.

APPLICATION FILED DEC; 30. m6.

Patented Aug. 17, 1920.

2 SHEETSSHEET 2.

wilt 14 cool/ t I UNITED STATES PAMTENT OFFICE.

JOSEPH B ERGEB, '73., OF UTICA, NEW YORK, ASSIGNOR T0 UNION SPECIALMACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

METHOD or UNITING FABRIC SECTIONS.

Specification of Letters Patent.

Patented Aug. 17, 1920.

To all whom it may concern Be it known that I, J OSEPH BERGER, Jr.,acitizen of the United States, residing at Utica, in the county ofOneida, State of New York, have invented certain new and usefulImprovements in Methods of Uniting Fabric Sections, of which the,following is a description, reference being had to the accompanyingdrawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in the method ofuniting fabric sections, and more particularly to the method ofattaching fabric sections to form a flat covered seam.

An object of the invention is to provide a new method of forming coveredlapped seams wherein the edges of the fabric sections are simultaneouslytrimmed as they are stitched and wherein the said edge portions arelapped so that said trimmed edges terminate within the limits of thestitching mech anism, whereby the overlapped sections will be penetratedby a central needle of the stitching mechanism, and said trimmed.

edges covered by the stitching threads.

In the drawing Figure 1 is a perspective view showing certain parts of asewing machine which may be used in carrying out the invention;

Fig. 2 is a perspective view showing the steps in the method whereby thefabric sections are united;

Fig. 3 is a plan View of the same;

Fig. 4 is }a sectional view through athroat plate and presser foot,showing more or less diagrammatically the trimming blades, the needles,and the looper which cooperates with the needles, the edge portions ofthe fabric sections being turnedup for trimtions and the relation of thestitching threads thereto.

The invention is directed broadly to a new method of joining fabricsections wherein the edge portions of the fabric sections are united bya stitching mechanism forming three parallel rows of needle thread loopsconnected above and below the fabric sections to form covering stitchesand said edge portions are trimmed in advance of and simultaneously withthe stitching-0f the seam, so that said edge portions will terminate inoverlapped relation and within the limits of the outer rows of needlethread loops and be penetrated by the central row of needle threadloops, whereby the over lapped edge portions will be joined and thetrimmed edges thereof covered by the stitching threads.

The invention resides particularly in the that the invention will be"more clearly understood by reference thereto.

The fabric sections to be joined are indicated at F and F, respectively.These fabric sections are brought together and their edge portions f and7 turned up out of the plane of the fabric sections, as clearly shown inFigs. 1 and 2.

The sewing machine parts illustrated in the drawings consist of apresser foot 1 having a slot 2 at its forward end into which thelip-turned fabric sections are directed. The trimming mechanismconsisting of a fixed trimming blade 3 and a movable trimming blade 4operates to trim the upturned edge portions. After the upturned edgeportions have been trimmed, a guiding memeher 5 on the presser footcrowds the trimmed edge portion 7 back into the plane of the fabric Fand underneath the edge portion f which is held raised by a rib 6 on thethroat plate. The rear end wall of the slot 2 in the presser foot thenserves to turn down the edge portion 7 so that the two edge portions areoverlapped, as clearly shown in the drawtain of the needles to enter sothat the needle threads on the upper face of the fabric are connected bya cross thread. The thread of the needle '2 is indicated at 7 the threadof the needle 8 is indicated at 8;

and the thread of the needle 9 is indicatedat 9*, While the cross threadis indicated at 10. Beneath the work support there is a single looper 12which enters all of the needle thread loops, and this looper carries alooper thread 12 which joins all the needle loops beneath the fabric:The throat plate 13 has the rib 6 formed therein which directs theupturned edge portions of the fabric sections. The surface 14- ef thethroat plate, ,which supports the fabric section F, is in a lower planethan the surface 15 which supports the fabric section F, The upturnededge portions are slightly at one side of thecenter needle, as clearlyshown in Fig. '4- of the drawings, and this arrangement greatlyfacilitates the turning of the edge portion 7 under the edge portion fand also insures that while the overlappe portions of the fabricsections are wholly within the limits of the stitching mechanism, yetthe extreme edges of the fabric sections lie close to the points wherethe respective outer needles penetrate the fabric sections.

From the above, it will be a parent that my improved method for j oininfabric sections consists in the simultaneous trimmin of the edgeportions of the fabric sections and the stitching of the same, and it isthrough the trimming action that the edge portions are overlapped withthe trimmed edges within the limits of the threads of the stitchingmechanism. After the edges have been trimmed and overlapped to theproper distance, then these overlapped edges are united by stitching,the center line of stitches passing through the overlapped portions ofthe fabric,,while the outer lines of stitches pass through therespective fabric sections only and close .to the trimmed edges. Thecross thread and the looper thread connecting the needle threads notonly aid in joining the fabric sections, but cover the trimmed edges ofthe fabric sections.

It will be obvious that minor changes in the steps of the methoddescribed in detail above may be made without departing from the spiritof the invention which it set forth in the, appended claim.

Having thus fully described the invention, what. is claimed as new isThe method of forming a covered lapped seam consisting in uniting theedge portions of fabric sections to form the seam by a stitchingmechanism forming three parallel rows of needle thread loops-connectedabove and below the fabric sections to form covering stitches andtrimming both ed "es in ad.- vance of and simultaneously with 516stitching of the seam, so that said edge portions will terminate inoverlapped relation and within the limits of the outer rows of needlethread loops andbe penetrated by the central row of needle thread loops,whereb the overlapped edge portions will be joinc and the trimmed edgesthereof will be covered by said threads.

In testimony whereof I afiix my signature, in the presence of twowitnesses.

JOSEPH BERGER, JR. Witnesses A. J. BAEOHLE, ARTHUR L. Wmoox.

